There is a work around. Close Safari. Go to Safari in the applications folder. Right Click. Get Info. Tick the Open In 32-bit mode box. Restart Safari. YouTube will now operate properly._________________Mac Book 2.1 Ghz (Penryn) 10.7.5 4Gb DDR2
Mac Mini 2.3 Ghz Intel iG 10.10.2 8Gb DDR3
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